Hairbrush



FIG. 1 is a front view of a hairbrush embodying the design.

FIG. 2 is a back view thereof.

FIGS. 3-4 are side views thereof.

FIG. 5 is a top view thereof.

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a isometric view thereof.

The broken-line showing of a back and handle illustrates portions of the hairbrush that form no part of the claimed design. 

The ornamental design for a hairbrush, as shown and described. 